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  <title>Perform a regular expression search and replace with multibyte support using a callback</title>
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  <div id="layout-content"><div id="function.mb-ereg-replace-callback" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mb_ereg_replace_callback</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.4.1, PHP 7)</p><p class="refpurpose"><span class="refname">mb_ereg_replace_callback</span> &mdash; <span class="dc-title">Perform a regular expression search and replace with multibyte support using a callback
  </span></p>

 </div>
   
 <div class="refsect1 description" id="refsect1-function.mb-ereg-replace-callback-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>mb_ereg_replace_callback</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$pattern</code></span>
   , <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$option</code><span class="initializer"> = &quot;msr&quot;</span></span>
  ] ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   Scans <code class="parameter">string</code> for matches to
   <code class="parameter">pattern</code>, then replaces the matched text
   with the output of <code class="parameter">callback</code> function.  
  </p>
  <p class="para">
    The behavior of this function is almost identical to <span class="function"><a href="mb_ereg_replace.html" class="function">mb_ereg_replace()</a></span>, 
    except for the fact that instead of
    <code class="parameter">replacement</code> parameter, one should specify a
    <code class="parameter">callback</code>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.mb-ereg-replace-callback-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">pattern</code></dt>

     <dd>

      <p class="para">
       The regular expression pattern.
      </p>
      <p class="para">
       Multibyte characters may be used in <code class="parameter">pattern</code>.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">callback</code></dt>

     <dd>

      <p class="para">
        A callback that will be called and passed an array of matched elements
        in the  <code class="parameter">subject</code> string. The callback should
       return the replacement string.
      </p>
      <p class="para">
        You&#039;ll often need the <code class="parameter">callback</code> function
        for a <span class="function"><strong>mb_ereg_replace_callback()</strong></span> in just one place.
        In this case you can use an
        <a href="functions.anonymous.html" class="link">anonymous function</a> to
        declare the callback within the call to
        <span class="function"><strong>mb_ereg_replace_callback()</strong></span>. By doing it this way
        you have all information for the call in one place and do not
        clutter the function namespace with a callback function&#039;s name
        not used anywhere else.        
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">string</code></dt>

     <dd>

      <p class="para">
       The <span class="type"><a href="language.types.string.html" class="type string">string</a></span> being checked.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">option</code></dt>

     <dd>

      <p class="para">
       The search option. See <span class="function"><a href="mb_regex_set_options.html" class="function">mb_regex_set_options()</a></span> for explanation.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 
 <div class="refsect1 returnvalues" id="refsect1-function.mb-ereg-replace-callback-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   The resultant <span class="type"><a href="language.types.string.html" class="type string">string</a></span> on success, or <strong><code>FALSE</code></strong> on error.
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.mb-ereg-replace-callback-notes">
  <h3 class="title">注释</h3>
  
  <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para"><span class="function"><a href="mb_regex_encoding.html" class="function">mb_regex_encoding()</a></span>
指定的内部编码或字符编码将会当作此函数用的字符编码。</p></p></blockquote>
 </div>


 <div class="refsect1 examples" id="refsect1-function.mb-ereg-replace-callback-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3186">
    <p><strong>Example #1 <span class="function"><strong>mb_ereg_replace_callback()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;this&nbsp;text&nbsp;was&nbsp;used&nbsp;in&nbsp;2002<br />//&nbsp;we&nbsp;want&nbsp;to&nbsp;get&nbsp;this&nbsp;up&nbsp;to&nbsp;date&nbsp;for&nbsp;2003<br /></span><span style="color: #0000BB">$text&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"April&nbsp;fools&nbsp;day&nbsp;is&nbsp;04/01/2002\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$text</span><span style="color: #007700">.=&nbsp;</span><span style="color: #DD0000">"Last&nbsp;christmas&nbsp;was&nbsp;12/24/2001\n"</span><span style="color: #007700">;<br /></span><span style="color: #FF8000">//&nbsp;the&nbsp;callback&nbsp;function<br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">next_year</span><span style="color: #007700">(</span><span style="color: #0000BB">$matches</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;as&nbsp;usual:&nbsp;$matches[0]&nbsp;is&nbsp;the&nbsp;complete&nbsp;match<br />&nbsp;&nbsp;//&nbsp;$matches[1]&nbsp;the&nbsp;match&nbsp;for&nbsp;the&nbsp;first&nbsp;subpattern<br />&nbsp;&nbsp;//&nbsp;enclosed&nbsp;in&nbsp;'(...)'&nbsp;and&nbsp;so&nbsp;on<br />&nbsp;&nbsp;</span><span style="color: #007700">return&nbsp;</span><span style="color: #0000BB">$matches</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">].(</span><span style="color: #0000BB">$matches</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">]+</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />}<br />echo&nbsp;</span><span style="color: #0000BB">mb_ereg_replace_callback</span><span style="color: #007700">(<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"(\d{2}/\d{2}/)(\d{4})"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"next_year"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$text</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
April fools day is 04/01/2003
Last christmas was 12/24/2002
</pre></div>
    </div>
   </div>
  </p>
  <p class="para">
   <div class="example" id="example-3187">
    <p><strong>Example #2 <span class="function"><strong>mb_ereg_replace_callback()</strong></span> using anonymous function
      supported in PHP 5.3.0 or later</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;this&nbsp;text&nbsp;was&nbsp;used&nbsp;in&nbsp;2002<br />//&nbsp;we&nbsp;want&nbsp;to&nbsp;get&nbsp;this&nbsp;up&nbsp;to&nbsp;date&nbsp;for&nbsp;2003<br /></span><span style="color: #0000BB">$text&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"April&nbsp;fools&nbsp;day&nbsp;is&nbsp;04/01/2002\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$text</span><span style="color: #007700">.=&nbsp;</span><span style="color: #DD0000">"Last&nbsp;christmas&nbsp;was&nbsp;12/24/2001\n"</span><span style="color: #007700">;<br /><br />echo&nbsp;</span><span style="color: #0000BB">mb_ereg_replace_callback</span><span style="color: #007700">(<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"(\d{2}/\d{2}/)(\d{4})"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;(</span><span style="color: #0000BB">$matches</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;</span><span style="color: #0000BB">$matches</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">].(</span><span style="color: #0000BB">$matches</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">]+</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;},<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$text</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.mb-ereg-replace-callback-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="mb_regex_encoding.html" class="function" rel="rdfs-seeAlso">mb_regex_encoding()</a> - Set/Get character encoding for multibyte regex</span></li>
    <li class="member"><span class="function"><a href="mb_ereg_replace.html" class="function" rel="rdfs-seeAlso">mb_ereg_replace()</a> - Replace regular expression with multibyte support</span></li>
    <li class="member"><a href="functions.anonymous.html" class="link">Anonymous functions</a></li>
    <li class="member"><a href="language.pseudo-types.html#language.types.callback" class="link">callback</a> 类型的信息</li>
   </ul>
  </p>
 </div>


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